IPhone 4S Not connecting to Wi-Fi after 7.0.4?

I have tried everything. It started not connecting every once in a while around Christmas. I thought it was just some error. Nope. I bought a new Wi-Fi router, no luck. Reset network settings on my phone, nope. I reset my whole phone! NOT A THING WORKED. I know apple will charge me $200 to replace my phone, but I don't have the money. I don't have service at my house so I can't just use it. I heard heating a blow dryer on it for 10 seconds then off for 2 seconds then repeating until it pops up with the over heated thing then home + power to reboot it would work but I don't want to fry my phone. How can I fix this. I'm getting really posed am going to take it into Verizoon some time this week if no one can give me a working answer.

Go into the routers settings and go on wireless. Select Security as WPA2 and for 2.4GHz band select 802.11b/g/n

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